Motor control device

Abstract

An inverter is provided with a temperature sensor for detecting the temperature of the inverter. A plurality of threshold values are set up for the temperature detected by the temperature sensor, electric current restricting conditions different from each other are set up for each of the temperature regions sorted out by each threshold value, and an inverter restricting unit for applying a restriction to an electric current command applied to the inverter in dependence on the electric current restricting condition of the temperature region, in which the detected temperature is included. Without the drivability of an automobile being disturbed, by means of a temperature control of the inverter, not only are any change in characteristic and impairment, resulting from an overheating thereof, prevented, but also an undesirable reduction of the life of the inverter is avoided.

Description

CROSS-REFERENCE TO THE RELATED APPLICATIONS[0001]This application is a U.S. national stage application of PCT / JP2012 / 080322 filed Nov. 22, 2012 and claims foreign priority benefit of Japanese Patent Application No. 2011-256140 filed Nov. 24, 2011 in the Japanese Intellectual Property Office, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a motor control device of an electrically driven motor and, more particularly, to a control device of a type used to drive a vehicle wheel in an electric automobile such as, for example, a battery driven automobile, a fuel battery driven automobile or a hybrid automobile with an engine concurrently.[0004]2. Description of Related Art[0005]In the electric automobiles, a synchronous motor and an induction motor are generally employed and are driven by a current, which has been converted from a direct current of a battery into an alternating cur...

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